Smarty pants.  Guess that is one way to cull the herd.  Tak about snarky,
sheeesh!a
Michael in San Antonio
91GL Weekender AT 2.1L 'Gringo'

On Mon, Nov 8, 2010 at 4:37 PM, Alistair Bell <albell@shaw.ca> wrote:

> Assumptions:
> 160lb human, breathing in/out 6l air/minute (reflects slower resp
> rate when sleeping)
> ambient temp -5 deg C (Canadian winter camping eh?)
> 70% rel humidity
>
> At this humidity there'd be 2.4 mg h2o/l of air inspired.
> Exhaled air would be heated to body temp / 100% humidity
>
> Heat up for 49.3 mg h2o / l
> "Humidity deficit" = 49.3 mg h2o/l MINUS 2.4 mg h2o/l = 46.9 mg h2o/L
>
> At 6 L air /minute there would be 281.4 mg h2o / min expired.
>
> This works out to 135 ml h2o over 8 hours.
>
> obviously less than your result for daytime rate, but your guess was
> pretty good. But might be more for mouth breathers (what's that you
> say BenT?)
>
> alistair
>
>
> On 8-Nov-10, at 2:25 PM, Mike S wrote:
>
> At 05:00 PM 11/8/2010, Alistair Bell wrote...
>
>> Michael, you'll love this, I have the data on how much water vapour a
>> sleeping 160lb guy breathes out when asleep in - 5 C van.
>>
>
> Please do tell. A quick google says humans lose 350-600 ml/day of
> water due to respiration. It would be lower during inactivity
> (sleep), so I'm guessing in the 75-100 ml range for 6 hours. But if
> it's -5C in the van, maybe it's more because you're shivering without
> a heater.
>